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11 Nov 2011, 06:14

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C

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Question Stats:

74%(02:16) correct
26%(01:43) wrong based on 240 sessions

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Every fall Croton's jays migrate south. The jays always join flocks of migrating crookbeaks with which they share the same summer and winter territories. If a jay from the crookbeaks it is accompanying, it wanders until it comes across another flock of crookbeaks. Clearly, therefore, Croton's jays lack the navigational ability to find their way south on their own.

Which of the following, if true, most strengthens the argument?

A. Croton's jays lay their eggs in the nests of crookbeaks which breed upon completing their southern migration.B. The three species most closely related to crookbeaks do not migrate at all.C. In the spring, Croton's jays migrate north in the company of Tattersall warblers.D. Species other than Croton's jays occasionally accompany flocks of migrating crookbeaks.E. In the spring, crookbeaks migrate north before croton's jays do.

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11 Nov 2011, 10:01

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This post receivedKUDOS

Here's the explanation:

The conclusion of the given argument is that 'Croton's jays lack the navigational ability to find their way south on their own'. The question asks us to strengthen the argument and hence this conclusion. Which of the given options would prove that the Croton's jays, indeed lack the navigational ability to find their way (south, north or any other direction)?

Option C clearly supports our conclusion by stating that the Croton's jays migrate north in the company of Tattersall warblers and it has already been given in the premise that Croton's jays always join flocks of migrating crookbeaks to travel south. Hence this option, along with the given premise supports the conclusion that Croton's jays indeed lack the navigational ability to find their way.

The other four options are clearly out of scope of the given argument.

Hope this helps.
_________________

MBA Candidate 2015 | Georgetown UniversityMcDonough School of Business

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27 Dec 2011, 22:33

C is the answer here. Others are out of scope. The navigational ability of the jays is under discussion here and option C strengthens the conclusion that the jays indeed lack that ability.
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16 Dec 2015, 14:41

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